"Normal dipping pattern is characterized by a >10% dip in the BP during the night. Nondipping pattern is associated with severity of the disease, target organ damage, secondary forms of hypertension, multiple cardiovascular risk factors, and poor long-term outcomes."

OBJECTIVES:
Vitamin D deficiency and high parathyroid hormone (PTH) levels have been linked with hypertension.
Nondipper hypertension is associated with increased morbidity and mortality.We aimed to investigate the relationship of vitamin D and PTH levels with nondipper hypertension and nocturnal decline in untreated hypertensive patients.

CONCLUSION:
In this study, vitamin D levels were significantly lower and PTH levels were significantly higher in nondippers. The vitamin D level was correlated positively and the PTH level was correlated negatively with nocturnal decline. In addition, PTH level was associated independently with nocturnal decline in hypertension.